Select backend from web GUI

[yampelo]

25, #41

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@3f88c66). Click here to learn what that means. The diff coverage is 18.66%.

@@            Coverage Diff            @@
##             master      #46   +/-   ##
=========================================
  Coverage          ?   71.18%           
=========================================
  Files             ?       46           
  Lines             ?     2415           
  Branches          ?        0           
=========================================
  Hits              ?     1719           
  Misses            ?      696           
  Partials          ?        0

Impacted Files	Coverage Δ
beagle/backends/neo4j.py	19.27% <33.33%> (ø)
beagle/backends/dgraph.py	16.45% <33.33%> (ø)
beagle/backends/networkx.py	76.92% <75%> (ø)
beagle/web/api/views.py	38.36% <8.33%> (ø)
beagle/backends/base_backend.py	78.57% <80%> (ø)

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[yampelo]

Added an "advanced options" toggle that exposes selecting the backend: